Knapton, E. J., & Derry, T. K. 1. j. a. (1966). Europe 1815 to the present. Scribner.
Lua i Stíl Chicago (17ú heag.)Knapton, Ernest John, agus Thomas Kingston 1901- joint author Derry. Europe 1815 to the Present. New York: Scribner, 1966.
Lua MLA (9ú heag.)Knapton, Ernest John, agus Thomas Kingston 1901- joint author Derry. Europe 1815 to the Present. Scribner, 1966.
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